Sanding machine



Aug. 25, 1931. E. w. CURTIS SANDING MACHINE Filed 00L 1928 2 Sheets-Sheet 1 Aug. 25, 1931.

E. W. CURTIS SANDING MACHINE Filed Oct. 12.. 1928, 2 Sheets- Sheet 2 1 I h 0 1 waww I dwara' 21/. Carfis Patented Ann. 25,1931

EDWARD ,w. cumrrs, or inlvms'rown, NE .Yomi

. "SANDING M GHINIE.

Application nled october 12-, 19 2s.. Serial m. 312, 0.

This invention relates-to an improvement in sanding machines and more" particularly to sanders of the spindle type; j

1 In its'preferred embodiment'this invention "has particularly tofido witha sanding .machine for use "by wood-workers and the like, for sanding and finishing surfaces not accesi plied to=variously shaped: surfaces sible'to the usual sanders in commonuse.v

Prior to this invention 1t has'been impossible to accomplish through the use of a' spindle sanding device, or any. other sanding device, the finishing 'of'angular, concave for convex surfaces. The reason for thisis that" heretoforeno sandingmachine has been produced'which Was adaptable to dress down all 'manner of angular-and curved surfaces. 1 In other words, when sanding concave or convex surfacesya certainytypeof sanding machine has-been used and'when it was desired to -necessary that another type of sanding madress down fiat or angular'surfaces, it was chine be usedor else that a smaller spindle replace one of a larger diameter. To remove I and replace a large spindle'for one of smaller diameter requires I, considerable time and, furthermore, the smallest practicalspindle is about one inch in diameter thus precluding its use upon work having angular'surfacesr It. is believed that 5 prior to this invention no in device has been made which would eliminate the hand sanding necessitated through the use of spindle orother types of sanders now on the market. The, principal convenient sanding device by which tosand or dress down allma'nn'er of curved and angular surfaceswithout any interchange of parts.

Another object of this invention is the pro-' will appear from a consideration of the fol-. lowing specification taken in connection with the accompanying drawings and in which Fig. 1 is a perspective view of this'inven tion, aportion of the table being broken away.

thereon; a 7 is a fragmentary view of the table I ,nb 'n' n of this invention is therefore is to provide a simple, compact, and

tion;

Fig. 2 is a side elevation of the vice shown in Fig. 1 with the ta'blein section;

Fig.3 is an enlarged perspective view of the spindle support and shows the three types of blocks which-adapt the-sander to beap- ."Figv isj'a vertical sectlonal -view' taken 7 through the spindle and. sanding'blocks and Fig. 5 is a front elevation 'of'th e-detachable spindleuprig'ht andshows the track in which the carriage .for'the blocks isjmounted;

to better illustrate the detailsof ansnna Fig.6 isa front elevationtof; the sandingY block carriage 'With the'b'locks inposition Fig. 7

and pedestal;and,

Figs. 8, 9 andlO are horizontal sectional views on an enlarged scale of thelthree'types of sanding blocks, Fig. 8' being convex and v i.

showing the engagement between it and. the

spindle upright, Fig. 9 the concave block and .Fig. 10 the flatblock. I

drawings and. particu Referring to the.

la-rly to Fig.1, this invention is adapted for use upon a table 10 mounted upon a. pedestal 11. The table 10 is providedv with an opening 14 through which. the sanding device eX-a tends'and is also fitted with a removable top I frame 21 having prong-like arms 22 termisection 15 by means of which;accessn ay be had to remove-or insert the sanding device. The sanding device 20is comprised of a nating the upper end thereof and between whicha freely 'movable'roller 23,18 mounted. The'frontface' of the frame 21 is provided.

. with an integral rail 25 and a removable rail 26." Between the rails 25and 26, whichare inwardlysloped to provide-a pocket 27, the

able manner, are blocks30, 31 and 32. The I block 30, which is conveX,fhasa suitable cushion strip, suchas felt, securedto the face thereof. The block 31 is concave and the block 32 is provided with a straight surface. 8

By means of any one of these three blocks, in front of which the sanding belt 34 passes, practically all kinds of wood surfaces may be dressed down. The lower end of the carriage 28 has a block 35 secured thereto and from which extends a threaded shaft 36, the purpose of which will later be brought out.

The frame 21 is adapted to be removably mounted with relation to the table, this being accomplished as follows: Secured in any suitable manner, as by welding, to the rear face of the frame is a plate 38 extending out- Wardly therefrom at right angles. The plate 38 is mouni ed within a support secured to the under side of the table 10 adjacent the pedestal 11 (see Fig. 7 This support is comprised of a bracket L0, secured by bolts 11 to the table 10, and has a downwardly depending arm 42. The arm 42 is provided with a horizontally extending channel or recess 43 and a plate d4 secured to the upraised walls of the recess l3 by means of screws 45 completely enclosing said recess. The recess 13, when covered by the plate 14:, creates a vertical pocket into which the plate 38' of the frame 21 is placed. Then the plate 38 has been placed within this pocket, a locking screw or wheel 47 threadably mounted within the plate 44- is turned down and securely locks the plate 88 and frame 21 in an upright position. Pivotally secured to a block (not shown) mounted upon the underface of the table 10, is a lever or arm 50, the actuating end of which extends beyond the edge of the table 10. A. horizontal slot 51 is cut in the arm and the bolt 36, secured to the carriage 28, enters this slot. The arm 50 may be held in engagement with the bolt 36 in any suitable manner either by a cotter pin passing through said bolt or a nut threadedly engaging the end thereof. The purpose of the arm 50 is to move up wardly or downwardly the carriage 28 to which the blocks 30, 31 and 32 are secured.

shown in Fig. 1 of the drawings, the convex sanding block is in position for use and when it is desired to make use of the concave or flat surface provided by the blocks 81 and 32, it is only necessary to move the arm downwardly to bring either of these blocks into position.

Inasmuch as the operator of a sanding machine of this type, of necessity must rapidly change from one operation to the other, it is essential that provision be made to properly locate each block with relation to the table top and this is accomplished, as may be seen in Fig. 8 of the drawings, through the use of small depressions 52 located in the rear face of the carriage 28 and spaced in accordance with the spacing of the sanding blocks. Vithin the frame 21 and. slightly beneath the upper face of the table is provided a ball check 53 mounted in a suitable opening 54-. The spring 55 forces the ball 53 against the rear face of the carriage 28 and as one of the depressions 52 come into line with the ball, said ball moves out into engagement with said depression. While 1 this check to the upward or downward move ment of the carriage is insufficient to stop such movement, it is sufliciently noticeable to act as a guide to the operator in order that he may know wh n'any one of the sanding blocks is in proper position for use.

Then sanding belt 34 is passed over the roller 28 of the frame 21, down through the opening M in the table 10, around the pulley 57 and thence upwardly and over the wheel 58 of the motor. The usual free weight pulley 59 is provided in order to prevent slack in the belt and consequent breaking thereof.

Although it is contemplated to make use of a spindle sander of substantially the proportions shown in the drawings, it is obvious that, due to the r'emovability of the frame 21, other frames having slidable carriages similar to thecarriage 28 may be made use of. This would be necessary'when it was decided to'provide sanding blocks of larger or smaller proportions or having varying sized curves and angular surfaces. The frame 21 and the roller 23 may be provided on a considerably reduced scale, the carriage and sanding blocks also-reduced, and the device used to dress down practically any kind of latticed work such as is used upon radio or phonograph cabinets.

When only one modification of this invention, has been shown and described, applicant does not intend to be limited thereto since it is obvious that other modifications or adaptations may be made without departing from the spirit and scope of this invention as set forth in the following claims.

Having thus set forth my invention what I claim is new and for which I desire protection by Letters Patent is:

1. In a wood sanding device having an endless sanding belt, a table having an opening therethrough, an upright frame removably secured to said table and extending through the opening therein, a carriage mounted for vertical reciprocation upon said frame, a plurality of sanding blocks secured to and extending outwardly from said carriage, and means adapted to raise or lower said carriage with relation to said frame whereby any one of said sanding blocks may be brought into position of use.

2. In a wood sanding device having an endless sanding belt, a table having an opening therethrough, an upright frame removably secured to said table and extending through thevopening therein, a carriage mounted for vertical reciprocation upon said frame, a plurality of sanding blocks removably sea cured to said carriage, means adapted to raise or lower said carriage and cause any one of sad sandmg blocks to move lnto posltlon of I use and a further means adapted'to check the A upward or downward movement of said carrlage when any one of sand sand lng blocks 1s 1n .posltlon of use.

7 In testimony whereof hove afiixed my signaturer EDWARD 'W. CURTIS, 

